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【单选题】
It's going to rain. You'd better _____ an umbrella [ ]A.
take
B.
to take
C.
taking
D.
will take
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举一反三
【单选题】某吸光物质的浓度为 1.0×10^(-4) mol×L-1，用 1 cm 吸收池于 525 nm 波长处测得吸光度为 0.400，则此吸光物质在 525 nm 处的摩尔吸收系数为
A.
4.0 × 10^(-3) L × mol-1 × cm-1
B.
4.0 × 10^3 L × mol-1 × cm-1
C.
4.0 × 10^(-5) L × mol-1 × cm-1
D.
4.0 × 10^5 L × mol-1 × cm-1
【单选题】The poor boy loves playing ________ football, and he really wants to have ________.
A.
the, a
B.
/, one
C.
the, one
【单选题】There is a boy student downstairs ______.
A.
wants to see you
B.
whom wants to see you
C.
which wants to see you
D.
he wants to see you
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