题目详情:

[单项选择]
M: Hi, you’re new here, aren’t you What’s your name
W: Stella.
M: Want to come and play
W: I’d like to. but I can’t. My Mum says I’ve got to stay and help her. It’s my brother’s birthday and we’re having a party, too.
M: Oh, you’ve got a brother, haven’t you
W: I’ve got two brothers. Kit, the one with the birthday, he’s only four. I’ve got a big brother who’s married, his name’s Don.
M: Does your brother Don live near here
W: Yes, not very far away. Cathy, my sister-in-law, works in the sweetshop over there. They’ve got a new baby called Liz. I mean Elizabeth really, but we call her Liz.
M: Is that your Mum over there calling you
W: No, that’s my Aunt May, my Mum’s twin sister. I’d better go. Bye.
M: Bye.
Why can’t Stella play（　）.
A. Because she doesn’t like to.
B. Because she has to help her mother.
C. Because she is having a party.

热门试题:

[单项选择]肾小球内三高是指
A. 高灌注、高滤过、高压力
B. 高压力、高蛋白、高滤过
C. 高压力、高滤过、高血脂
D. 高灌注、高血脂、高压力
E. 高灌注、高滤过、高蛋白

[名词解释]聚合物浸渍混凝土

[不定项选择题]共用题干 The Tough Grass That Sweetens Our Lives

Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their
houses and fencing their gardens. Gradually a different variety evolved which contained sucrose（蔗糖） and
was chewed on for its sweet taste.Over time,sugar cane became a highly valuable commercial plant,grown
throughout the world.___________(46)
Sugar became a vital ingredient in all kinds of things , from confectionery（糖果点心）to medicine,
and,as the demand for sugar grew,the industry became larger and more profitable.________(47)Many
crops withered（枯萎）and died,despite growers'attempts to save them,and there were fears that the
health of the plant would continue to deteriorate.
In the 1960s,scientists working in Barbados looked for ways to make the commercial species stronger
and more able to resist disease.They experimented with breeding programmes,mixing genes from the wild
species of sugar cane,which tends to be tougher,with genes from the more delicate,commercial type.
________(48)This sugar cane is not yet ready to be sold commercially,but when this happens,it is
expected to be incredibly profitable for the industry.
__________(49)Brazil,which produces one quarter of the world's sugar,has coordinated an interna-
tional project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo.Teams
of experts have worked with him to discover more about which parts of the genetic structure of the plant are
important for the production of sugar and its overall health.
Despite all the research,however,we still do not fully understand how the genes act in sugar cane.
_________(50)This gene is particularly exciting because it makes the plant resistant to rust,a disease which
probably originated in India,but is now capable of infecting sugar cane across the world.Scientists believe
they will eventually be able to grow a plant which cannot be destroyed by rust. _________（50）
A.Eventually,a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.
B.Unfortunately,however,the plant started to become weaker and more prone to disease.
C.One major gene has been identified by Dr Angelique D, Hont and her team in Montpelier, France.
D.The majority of the world's sugar now comes from this particular commercial species.
E.Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.
F.Since the 1960s,scientists have been analysing the mysteries of the sugar cane'S genetic code.