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【单选题】
某矿泉水瓶的标签上印有如下字样：Ca≥4．0mg/L、Mg≥0．5mg/L、K≥0．35mg/L、Na≥0．8mg/L等，这里的Ca、Mg、K、Na是指：A.
元素
B.
分子
C.
原子
D.
离子
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反馈参考答案：
举一反三
【单选题】高血压的定义为未服抗高血压药情况下
A.
收缩压＞140mmHg
B.
收缩压≥140mmHg和(或)舒张压≥90mmHg
C.
收缩压＞130mmHg，舒张压＞85mmHg
D.
收缩压＞120mmHg，舒张压＞80mmHg
E.
收缩压≥130mmHg
【单选题】All of us need ______.
A.
to feel needed and admired
B.
feeling needed and admired
C.
to feel being needed and admired
D.
to feel needing and admiring
【单选题】All ______ is an adequate supply to meet the demand.
A.
needed
B.
the things needed
C.
that needed
D.
what is needed
【单选题】高血压的定义是( )
A.
收缩压≥140mmHg和舒张压<90mmHg为单纯性舒张期高血压
B.
在未用抗高血压药的情况下，非同日三次测量，收缩压≥140mmHg和/或舒张压≥90mmHg
C.
同日三次测量，收缩压≥140mmHg和/或舒张压≥95mmHg
D.
在未用抗高血压药的情况下，非同日三次测量，收缩压≥140mmHg和舒张压≥90mmHg
【单选题】Construction is expanding all over China, no doubt many materials will be needed at a very big amount in future.
A.
China, no doubt many materials will be needed for a very big amount
B.
China, no doubt many materials will be needed in a very big amount
C.
China no doubt many materials will be needed in large amounts
D.
China no doubt many materials will be needed for large amounts
【单选题】All __________is a continuous supply of the basic necessities of life．A.which is needed###
A.
All __________is a continuous supply of the basic necessities of life． A.which is needed
B.
the thing needed
C.
for our needs
D.
that is needed
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