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【单选题】
下列关于珊瑚礁形成与分布的正确叙述是A.
珊瑚礁的形成过程依次是：岸礁--堡礁--环礁
B.
珊瑚礁形成的每个阶段都伴随着地壳的下沉
C.
大洋洲、南美洲、非洲、亚洲周围的海域均有珊瑚礁分布
D.
堡礁形成伴随着湖泊的出现
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【单选题】根据下列文章,请回答 36～40 题。Where Ha ve All the Frogs Gone? In the 1980s, scientists around the world began to notice something strange: Frogs were disappearing. More recent research has shown that many kinds ...
A.
knowledge about fatal human diseases.
B.
knowledge about air and water pollution.
C.
A chance to discover new medicines.
D.
an opportunity to detect poisonous gases.
【简答题】It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson. A．until B．after C．since D．when
【单选题】It is difficult for us to learn a lesson in life __________ we've actually had that lesson. [ ]
A.
when
B.
after
C.
since
D.
until
【单选题】It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
A.
until
B.
after
C.
since
D.
when
【单选题】I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.
A.
is
B.
was
C.
are
D.
were
【简答题】已知(1-2x) 7 =a 0 +a 1 x+a 2 x 2 +…+a 7 x 7 . 求:(1)a 1 +a 2 +…+a 7 ; (2)a 1 +a 3 +a 5 +a 7 ; (3)a 0 +a 2 +a 4 +a 6 ; (4)|a 0 |+|a 1 |+|a 2 |+…+|a 7 |.
【简答题】找规律填数。 (1) 1, 2, 4, 7, 11, ( ), ( )。 (2) 7, 13, 19, ( ), ( )。
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