[单项选择]While some bacteria are beneficial, others are ______in that they cause disease.
A. detrimental
B. prodigious
C. intrusive
D. mordant

[单项选择]While some bacteria are beneficial, others are {{U}}harmful{{/U}} in that cause disease.
A. detrimental
B. prodigious
C. intrusive
D. mordant

[单项选择]Some mushrooms are edible while others, which look almost identical, contain ______ poisons.
A. deadly
B. hasty
C. dizzy
D. gloomy

[单项选择]While some office jobs would seem ______ to many people, there are quite a few jobs that are stimulating, exciting and satisfying.
A. hostile
B. tedious
C. fantastic
D. attractive

[单项选择]While some office jobs would seem {{U}}boring{{/U}} to many people, there are quite a few jobs that are stimulating, exciting and satisfying.
A. hostile
B. tedious
C. fantastic
D. courageous

[多项选择]While troubleshooting some connectivity issues，you issue the “show ip ospf database”in order to ex amine the link state database. Which three of the statements below are true regarding the OSPF link state database（）
A. Each router has an identical link state database.
B. External routes are imported into a separate link state database.
C. Syn chronization of link state databases is maintained via floodingo f LSAs.
D. Information in the link state database is used to build a routing table by calculating a shortest-path tree.
E. By default,link state databases are refreshede very 10 minutes in the absence of topology changes.

[单项选择]Some species of bacteria and fungi {{U}}thrive on{{/U}} simple compounds such as alcohol.
A. mix with
B. do well on
C. exist in
D. float on

[单项选择]Though rather young in comparison with some others, ______ is the biggest university in England.
A. The University of Manchester
B. The University of Wales
C. The University of Edinburgh
D. The University of London

[单项选择]Some professors prefer to control discussion while others prefer to guide the class without ______ it.
A. enforcing
B. dominating
C. enhancing
D. disposing

[单项选择]While sleeping, some water mammals tend to keep half awake in order to _________.
A. alert themselves to the approaching enemy
B. emerge from water now and then to breathe
C. be sensitive to the ever-changing environment
D. avoid being swept away by rapid currents

[单项选择]Please listen carefully while others ______.
A. speak
B. speaking
C. spoken
D. spoke

[单项选择]Some minerals are quite common, others are regionally _________, and still others are rare on the earth.
A. attributed
B. distributed
C. contributed
D. scattered

[单项选择]Some American colleges are state-supported, others are privately __________, and still others are supported by religious organizations.
A. ensured
B. attributed
C. authorized
D. endowed

[单项选择]Some useful ideas were suggested while the social committee was ______ about the clubs program for the coming season.
A. discussing
B. quarrelling
C. arguing
D. disputing

[单项选择]

Some houses are designed to be smart. Others have smart designs. An example of the second type of house won an Award of Excellence from the American Institute of Architects.
Located on the shore of Sullivan’s Island off the coast of South Carolina, the award-winning cube-shaped beach house was built to replace one smashed to pieces by Hurricane (飓风) Hugo 10 years ago. In September 1989, Hugo struck South Carolina, killing 18 people and damaging or destroying 36,000 homes in the state.
Before Hugo, many new houses built along South Carolina’s shoreline were poorly constructed, and enforcement of building codes wasn’t strict, according to architect Ray Huff, who created the cleverly-designed beach house. In Hugo’s wake, all new shoreline houses are required to meet stricter, better-enforced codes. The new beach house on Sullivan’s Island should be able to withstand a Category 3 hurricane with peak winds of 179 to 209 kilometers per hour
A. to strengthen the pilings of the house
B. to give the house a better appearance
C. to protect the wooden frame of the house
D. to slow down the speed of the swelling water