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【判断题】
所有痕量元素，当其浓度超过安全界限时，都有可能具有毒性。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】His refusal to walk through the metal detector before boarding the plane ______ the guard's suspicion.
A.
awakened
B.
aroused
C.
predicted
D.
forecast
【单选题】The Minister’s ________ statement before boarding the plane left the reporters guessing as to the true purpose of his trip.
A.
brief
B.
aware
C.
unlike
D.
sweat
【简答题】Passengers will u ( 经受 ) body searches by security guards before boarding the plane.
【单选题】Passengers will body searches by security guards before boarding the plane.
A.
undermine
B.
understand
C.
undergo
D.
underlie
【简答题】读“眼球结构图”，回答下列问题． （1）图中标号1的结构名称是______；标号2是______；标号4是______． （2）眼球内容物包括______、______和______． （3）我们看到的物体在______上成像． （4）视觉最终在______形成．
【单选题】Before boarding the airplane, you have to check in ___ luggage over there.
A.
lies in
B.
advantageous
C.
maintenance
D.
bulky
E.
volume
F.
transport
G.
delivery
【简答题】Before boarding the airplane, you have to check in ________ luggage over there.
【单选题】Passengers will body searches by security guards before boarding the plane.
A.
undergo
B.
underline
C.
undertake
D.
understand
【简答题】(泰州期末)AII the passengers, according to the new regulation, ___before boarding the subway.A. will inspect B. are to be inspected C. are going to inspect D. are about to be inspected
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