大洋深层水的运动及主要特征？

下列比较中，正确的是            

A．等温等物质的量浓度溶液中，HF比HCN易电离，则NaF溶液的pH比NaCN溶液大

B．0.2 mol/L NH₄Cl溶液和0.1 mol/LNaOH溶液等体积混合后：c(NH₄⁺)＞c(Cl^－)＞c(Na⁺)＞c(OH^－)＞c(H⁺)

C．物质的量浓度相等的H₂S和NaHS混合溶液中：c(Na⁺)= c(S^2－)+ c(HS^－)+ c(H₂S)

D．同浓度的下列溶液中：①NH₄Al(SO₄) ₂②NH₄Cl③CH₃COONH₄④NH₃·H₂O，c(NH₄⁺)由大到小的顺序是①＞②＞③＞④

列句子中加点的词语，含义相同的一组是(    )

A．①是以人多以书假余

②君子生非异也，善假于物也

B．①沛公已去，间至军中

②侯生乃屏人间语

C．①彼竭我盈，故克之

②如其克谐，天下可定也

D．①呜呼!孰知赋敛之毒有甚是蛇者乎②吾知子之所以距我，吾不言

One day Jack’s wife was cleaning out a closet(壁橱).

"Look at all these umbrellas," she said to Jack. "There are eight and they are all broken."

"I’ll take them to the umbrella shop and have them mended," Jack said.

Jack took the eight umbrellas to the shop and left them there. "They’ll be ready tomorrow," the shopkeeper said.

That evening Jack went home from the office by bus as usual. He sat next to an old woman. She had an umbrella on the floor near her.

When the bus reached his stop, he picked up her umbrella and stood up. "Hey!" the woman said. "That’s my umbrella !"

"I’m sorry," Jack said, and at the same time he gave the umbrella to her. "I wasn’t thinking. Please excuse me."

The next day he got back the umbrellas from the umbrella shop and got on the bus.

As he sat down, a voice behind him said, "You certainly have a successful day!"

He turned around and saw the woman whose umbrella had almost been taken by him the day before.

That evening the old woman’s umbrella was almost taken by （）.

A．the shopkeeper

B．Jack’s wife

C．Jack

D．the driver

北京人

《中华人民共和国食品安全法》是从（）起开始实施的。

A.2008年6月1日

B.2009年6月1日

C.2010年6月1日