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【单选题】
镭是元素表中第七ⅡA族元素，下列关于镭的性质的叙述中不正确的是 [ ]A.
在化合物中呈+2价
B.
氢氧化物呈两性
C.
单质使水分解，放出氢气
D.
碳酸盐难溶于水
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【单选题】What was the possible cause of the outbreak of coronovirus?
A.
A kind of animal
B.
A kind of insect
【单选题】A ________of technology is working hardly to research the useful vaccine against the coronovirus.
A.
panel
B.
pancake
C.
pancreatic
D.
penniliess
【单选题】During coronovirus epidemic, ______ cases are required to do quarantine at home for at least 14 days.
A.
suspected
B.
confirmed
C.
critical
【简答题】现在你准备网上购物,你可以选择哪些支付方式?请列出( 6 种以上):
【简答题】Read the three words "Novel Coronovirus Pneumonia".
【单选题】The new research reveals that the novel coronovirus can spread during ______ period.
A.
isolation
B.
incubation
C.
quarantine
【单选题】Which is not the main symptom of novel coronovirus-caused pneumonia?
A.
cough
B.
fever
C.
running nose
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