【单选题】
Many kings and emperors used ( ) chopsticks to test whether the food was poisonous.
①
bamboo
②
green jade
③
elephant tusk
④
silver
【单选题】
IF(logical_test.value_if_true.value_if_false)中.value_if_true的含义是（ ）
①
logical_test为true时返回的值
②
logical_test为false时返回的值
③
表示计算结果为true或false的任意值或表达式
④
没有特殊含义.可以删除
【单选题】
5.Sometimes animals can _______ the coming disaster, so they can protect themselves.
①
imagine
②
taste
③
sense
④
ignore
【单选题】
Professor Smith, together with twenty of his students, [] coming to our school in May for a short visit.
①
is
②
are
【单选题】
Scientists say it may be five or ten years __________ it is possible to test this medicine on human patients.
①
since
②
before
③
after
④
when
【单选题】
A: Unbelievable! I have failed the driving test again! B: [填空]. This is not the end of the world.
①
Good job
②
Cheer up
③
Go ahead
④
Thats a pity
【单选题】
It was not until he arrived in class _____ realized he had forgotten his book.
①
when he
②
that he
③
and he
④
he