题干

短周期原子序数依次增大的主族元素R、T、Q、W、Y、Z具有如下信息:①R、Y原子的最外层电子数与电子层数相同;②Q是地壳中含量最高的元素,R与T的核电荷数之和等于Q的核电荷数;③W与R同主族,Z与Q同主族。下列说法正确的是(    )

A:Q与Y组成的常见物质是一种两性物质,能与氨水反应

B:已知WRZQ3溶液呈酸性,若将WRZQ3固体溶于水,能促进水的电离

C:元素Q与W形成的两种常见化合物中含有相同比例的阴、阳离子

D:元素T、Q、W、Y的原子半径大小为T<Q<Y<W

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答案(点此获取答案解析)

C

同类题2

根据短文理解,选择正确答案。

    For many people around the world, a subway journey means speeding from one dull station to the next, surrounded by too many uncomfortable, impatient people. But on the Moscow Metro, taking the subway is like walking through a national heritage site. Depending on where you get off, you'll receive a brief course in architectural movements and face colorful glass windows, marble(大理石) columns, gilded(鎏金的) mosaics and painted scenes from Russian history.

    “These extraordinarily beautiful places are unlike any metro station I've ever seen, “says Vancouver-based photographer David Burdeny.

    When Burdeny, who himself has a master's degree in architecture, first found out about Moscow's metro stations, he was struck by the work of art. In all, he has photographed 20 of the most beautiful stations.

    Burdeny had originally planned to focus on Russian stations more generally, taking photos of examples in both St. Petersburg and Moscow.

    “But when I saw the stations in Moscow, they just completely blew away the St. Petersburg ones,” he says.

    Shooting in the subway sounds simple, but it is not without challenges. For one thing, Burdeny had to figure out a way to access them between 00:30 a.m. and 5:30 a.m., when the stations were closed.

    In the end, he settled on Arbatskaya Metro Station, whose vaulted(拱状的) arches he found the most beautiful. But it also represented a challenge he was not sure if he was able to overcome: conveying the hugeness of the spaces. The Arbatskaya platform, for example, stretches 820 feet.

    “Some of the arches are quite long,” he says. “When you enter them, they're just so completely grand.”