下列实验的基本操作中正确的是（ ） A． 取用液体 B． 取用固体 C． 读取液

张某欲为其62岁的母亲和8岁的女儿投保意外伤害保险。为此，他向保险公司详细询问了有关意外伤害保险的具体条件，也如实地回答了保险公司的提问。在张某为其女儿投的意外伤害保险中，受益人如何产生

A．因其女儿为无民事行为能力人，故张某以其监护人的身份指定受益人

B．张某女儿虽无民事行为能力，但因为她是该保险合同的被保险人，故她可以指定受益人

C．因其女儿无民事行为能力，故她可以委托张某指定受益人

D．张某作为投保人可以指定受益人，但必须征得其女儿被保险人的同意

金属铁被硫化氢腐蚀，化学反应式正确的是（）。

A、Fe＋H₂S→H₂＋FeS

B、Fe＋H₂S→H₂＋Fe₃O₄

C、Fe＋H₂S→H₂O＋FeS

D、3Fe＋4H₂S→4H₂＋Fe₃S₄

椎动脉型颈椎病的特点是：（）

A.头痛头晕，耳鸣眼花

B.声音嘶哑，吞咽困难

C.心率改变，听力下降

D.头部旋转时眩晕，甚至猝倒

E.上肢窜痛窜麻

Personality is to a large extent inherent. A-type parents usually (1) A-type offspring. But the environment must also have a profound effect (2) if competition is important to the parents, it is (3) to become a major factor in the lives of their children.

One place where children (4) A characteristics is school, which is, (5) its very nature, a highly competitive institution. Too many schools (6) the "win at all costs" moral standard and measure their success by sporting achievements. The current (7) for making children compete against their classmates or against the (8) produces a two-layer system, in which competitive A types seem in some way better than their B type fellows. Being too (9) to win can have dangerous consequences: remember that Pheidippides, the first marathon runner, (10) dead seconds after saying. "Rejoice, we conquer!"

(11) the worst form of competition in schools is the disproportionate emphasis on examinations. There is, for example, a (12) school that allows pupils to concentrate on those things they do well. The (13) of competition by examination are somewhat questionable, but competition in the certain (14) of failure is positively harmful.

(15) , it is neither practical nor desirable that all A youngsters change into B’s. The world needs types, and schools have an important duty to try to (16) a child’s personality to his possible future employment. It is top management.

If the preoccupation of schools with academic work was (17) , more time might be spent teaching children surer values. Perhaps selection (18) the caring professions, especially medicine, could be made less by good grades in chemistry and more by such (19) as sensitivity and sympathy. It is surely a mistake to choose our doctors exclusively from A type stock. B’s are important and should be (20) .

2（）

A.when

B.since

C.although

D.and

干气密封也有一定的泄露。