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Breastfeeding Can
Cut Cardiovascular Risk{{/B}} Breastfeeding can reduce the risk of a heart attack or stroke later in life and could prevent hundreds of{{U}} (1) {{/U}}of deaths each year, researchers said on Friday. Babies who ale breastfed have fewer childhood infections and allergies and are less{{U}} (2) {{/U}}to obesity. British scientists have now shown that breastfeeding and slow growth in the first weeks and months of life has a protective effect{{U}} (3) {{/U}}cardiovascular disease. "Diets that promote more rapid growth put babies at risk many years later in{{U}} (4) {{/U}}of raising their blood pressure, raising their cholesterol and increasing their tendency to diabetes and obesity--the{{U}} (5) {{/U}}main risk fact A. smaller B. greater C. faster D. worse 更多"阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的"的相关试题: [单项选择]
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
Dark Forces Dominate Universe The Earth, moon, sun and
all visible stars in the sky make up less than one percent of the universe.
Almost all the rest is dark matter and dark energy, unknown (1)
that puzzle astronomers. Observations in recent years
have changed the basic understanding of how the universe evolved and have
emphasized for astronomers how little is known (2) the major
forces and substances that shaped our world. Astronomers now know
that luminous matter-stars, planets and hot gas — (3) only
about 0.4 percent of the universe. Non. luminous components, such as black holes
and intergalactic gas, make up 3.6 percent. The rest is either dark matter,
about 23 percent, or dark energy, about 73 percent. Dark matter,
sometimes called "cold dark matter" has been known for some (4)
. Only recently have researchers come to understand the pivotal
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