2024届高考英语外刊阅读天天练：语法填空九

高考英语外刊阅读天天练：语法填空模拟训练九 ① Free floating planets are roaming the Milky Way, unattached to a host star, just out there ___1____ their own. Scientists used ____2____(think) there were billions of such rogue planets in our galaxy, but a new study says that estimate was off by orders of magnitude: It's more likely to be trillions. That would mean such “dark’ planets ____3_____(be) six times more abundant than those ___4____ orbit a sun, such as Earth and its neighbors in this solar system. The new study also contradicted earlier, disputed research ____5_____(suggest) that most free-floating planets were the size of Jupiter. Instead, the new study found, rocky, Earth-size planets form the vast ____6_____(major) - -indeed, they are probably about 180 times more common than Jupiter-like giants. ____7_____ all these rogue planets formed is not yet clear. One theory holds that ____8_____ two protoplanets smash into each other, the impact can knock one of them out of the nascent star system. Co-author David Bennett of NASA says the abundance of rogues in the Milky Way suggests that this formation process is “maybe more common than theorists might ____9_____(guess)." But it remains a mysterious area of astronomy. Scientists are still not entirely sure ___10_____ rogue planets are truly rogue at all- -it may just be that their orbit is too wide for us to determine their host star. 【The Week USA(August 21, 2023)】 ② The money Americans think they’ll need to retire comfortably ____1_____(keep) growing and growing. A recent survey by Charles Schwab found that, on average, the figure that people feel they need ____2______(save) to retire is $1.8 million, up from $1.7 million only a year ago. Their math makes sense ___3_____ a conservative “rough estimate.” Unfortunately, few Americans are close. That $1.8 million is yet another retirement number ____4____(cause) unnecessary panic. “A $1.8 million balance would buy a 65-year-old couple an immediate annuity paying a guaranteed lifetime