[单项选择]In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
A. signal
B. chance
C. mark
D. measure

[单项选择]In our class, when the bell rang and the teacher closed his book, it was a （　） for everyone to stand up.
A. signal
B. chance
C. mark
D. measure

[单项选择]（）had I finished the test（）the bell rang.
A. Never ... then
B. No sooner ... then
C. Hardly ... when
D. Seldom ... when

[单项选择]______ had I reached school than the bell rang.
A. No sooner
B. Only
C. Hardly
D. Rarely

[单项选择]Our teacher never （　） us leave class early.
A. lets
B. allows
C. make
D. tells

[填空题]He (read)（）a book when the telephone rang.

[填空题]The Smiths (have)（）dinner when the phone rang suddenly.

[单项选择]They______TV when the telephone rang.
A. are watching
B. were watching
C. watched

[单项选择]第二篇When Our Eyes Serve Our Stomach Our senses aren’t just delivering a strict view of what’s going on in the world； they’re affected by what’s going on in our heads. A new study finds that hungry people see food-related words more clearly than people who’ve just eaten. Psychologists have known for decades that what’s going on inside our head affects our senses. For example, poorer children think coins are larger than they are, and hungry people think pictures of food are brighter. Remi Radel of University of Nice Sophia-Antipolis, France, wanted to investigate how this happens. Does it happen right away as the brain receives signals from the eyes or a little later as the brain’s high-level thinking processes get involved. Radel recruited 42 students with a normal body mass index. On the day of his or her test, each student was told to arrive at the lab at noon after three or four hours of not eating. Then they were told there was a delay. Some were told to come back in 10 minutes; o
A. humans’ senses are influenced by what’s going on in their heads.
B. they have sharper senses than others.
C. they lose their senses because of poverty and hunger.
D. humans’ senses are affected by what they see with their eyes.

[单项选择]

When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain how exactly dying stars could blow away these clouds. Now astrophysicists propose that unexpected chemical reactions during the formation of stardust could help solve this mystery.
Stars smaller than the Sun and up to eight times as massive die by swelling up into red giants before shedding most of their mass to shrink into very compact, dying embers (灰烬) called white dwarfs. Two kinds of red giants exist-those with lots of carbon, and others richer in oxygen than in carbon. Carbon-rich stars release carbon particles during their death throes. Scientists proposed these pitch-black grains absorb rays from the dying star and get shot into space by starlight, a theory that fit both the observations and computer models.
Increasingly, however, researchers could not explai
A. explain-the possible way of death of our Sun.
B. show the two types of red giants.
C. discuss on the way of red giants to become white dwarfs.
D. explore the origin of life.